Molecular model of penicillin by Dorothy M Crowfoot Hodgkin, England, 1945
1945
1945
1940
circa 1939
1940
1839 (original); circa 1988 (replica)
1940-1945
1937
1940
1990-96
1937
1942
1943
1943-1945
1938 and 1951
1937-1938
1940-1944
1903 (original); 1982 (model)
1945
1946
1937
2000-100 BCE
1938-1940
1943
1938
1940
1946
1937
4000-2001 BCE
1939-1945
1942
circa 1940
1955; 1830
1945
1946
1943
1943
1937-1938
1938
1938-1939
1938
1944
1942-1945
circa 1945
1945-1946
1937-1937
1938
1942
1937-1938
1938
1945